The marginal revenue​ (in thousands of​ dollars) from the sale of x gadgets is given by the following function. The revenue from 130 gadgets is ​$56,376. MR​(x)=4xx2+30,000− 2 3 ​(a) Find the revenue function. ​(b) What is the revenue from selling 250 ​gadgets? ​(c) How many gadgets must be sold for a revenue of at least ​$45​,000?

Mr. pines is considering buying a house and renting it to students. the yearly operating costs are $1,900. the house can be sold for $175,000 at the end of 10 years and it is considered 18% to be a suitable annual effective interest rate. if the house costs $100,000 to purchase, how much would you need to charge your tenants each year in rent? (assume a single payment for the years rent at the end of each year)